python3: Counting repeated occurrence in a list - python-3.x

Question

Each line contains a special timestamp, the caller number, the receiver number, the duration of the call in seconds and the rate per minute in cents at which this call was charged, all separated by ";”. The file contains thousands of calls looks like this. I created a list instead of a dictionary to access the elements but I'm not sure how to count the number of calls originating from the phone in question
timestamp;caller;receiver;duration;rate per minute
1419121426;7808907654;7807890123;184;0.34
1419122593;7803214567;7801236789;46;0.37
1419122890;7808907654;7809876543;225;0.31
1419122967;7801234567;7808907654;419;0.34
1419123462;7804922860;7809876543;782;0.29
1419123914;7804321098;7801234567;919;0.34
1419125766;7807890123;7808907654;176;0.41
1419127316;7809876543;7804321098;471;0.31
Phone number || # |Duration | Due |
+--------------+-----------------------
|[phone]||384|55h07m53s|$ 876.97|
|[phone]||132|17h53m19s|$ 288.81|
|[phone]||363|49h52m12s|$ 827.48|
|[phone]||112|16h05m09s|$ 259.66|
|[phone]||502|69h27m48s|$1160.52|
|[phone]||259|35h56m10s|$ 596.94|
|[phone]||129|17h22m32s|$ 288.56|
|[phone]||245|33h48m46s|$ 539.41|
|[phone]||374|52h50m11s|$ 883.72|
list =[i.strip().split(";") for i in open("calls.txt", "r")]
print(list)

Answer 1

I have very simple solution for your issue:
First of all use with when opening file - it's a handy shortcut and it provides sames functionality as wrap this funtion into try...except. Consider this:
lines = []
with open("test.txt", "r") as f:
for line in f.readlines():
lines.append(line.strip().split(";"))
print(lines)
counters = {}
# you browse through lists and later through numbers inside lists
for line in lines:
for number in line:
# very basic way to count occurences
if number not in counters:
counters[number] = 1
else:
counters[number] += 1
# in this condition you can tell what number of digits you accept
counters = {elem: counters[elem] for elem in counters.keys() if len(elem) > 5}
print(counters)

Answer 2

This should get you started
import csv
import collections
Call = collections.namedtuple("Call", "duration rate time")
calls = {}
with open('path/to/file') as infile:
for time, nofrom, noto, dur, rate in csv.reader(infile):
calls.get(nofrom, {}).get(noto,[]).append(Call(dur, rate, time))
for nofrom, logs in calls.items():
for noto, callist in logs.items():
print(nofrom, "called", noto, len(callist), "times")